Irrational Number Line Games has yet another 40K conversion project. This time digging up some old school chaos god that might be heresy now (at least heresy against GW's IP woes). But it makes a nice set of figures and the big guy is pretty fun, even if not doctrinal.

nvdoyle also advocated for the doomed champion idea. I like that as a motif.

The only comics I have been able to find show him as more of a fantasy character vice a scifi one. But that transition shouldn't be hard. Instead of finding one, I would rather make my own. (I just finished up a nice custom Doomrider for my son.) I think the key elements for a KD doomed champion would be:

* black and white hair* hand weapon with skull on it* lots of plates on the armour